US 2075482 A
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March 30, 1937. H. B. THORPE TRACTOR SCRAPER Filed Aug; 27, 1935 3 Sheets-Sheet l March 30, 1937. H. B. THORPE TRACTOR SCRAPER Filed Aug; 27, 1955 3 Sheets-Sheet 2 Invenlor A ltorney March 30, 1937. I H. B. THORPE 2,075,482
TRACTOR SCRAPER Filed Aug. 27, 1955 3 Sheets-Sheet 3 Inventor Attorney Patented Mar. 30,1931
UNITED STATES PATENT OFFICE 2,075,282 'msc'roa semen Harry Barney Thorpe, Vlsolia, 0011!. Application August 27, 1935, Serial No. 38.1%
Claims. (Cl. 37-144) This invention relates to scrapers for attachment to a tractor and which may be employed for bulldozing, etc., and an object o! the invention is to provide a tractor of this character hav- 5 ing improved means for mounting the scraper blade and also improved means for varying the angle of the blade with respect to the line of draft. a
In accordance with the present invention, hy-
draulic means is provided for changing the angle of the blade whereby the blade can be easily and quickly changed at the will of the operator thereby tending to save a great deal of time and ex pense in the operation thereof and obviates the necessity of backing up'or exchanging the blade by hand.
The invention together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawings wherein:
Figure l is top plan view illustrating the application of the invention to-a tractor.
Figure 2 is a detail view taken substantially on the line 2-4 of Figure 1.
Figures is an enlarged detail sectional view taken through a guide cylinder and piston assembly.
Figure 4 is a detail sectional view taken substantially on the line 4-4 oi. Figure 2; so Figure 5 isaplan view of a reciprocating rod. Figure 6 is a view similar to Figure5 showing the reciprocating rod connected with one end oi! the piston rod.
Figure '7 is a detail view taken substantially on theline |--1 otFlgureZ. l
Figure 8 is a detail view taken substantially on the line H of Figure 1. Figure 9 is an enlarged longitudinal sectional view through the guide member and reciprocating rod assembly.
Figure 10 is a detail view taken substantially on the line lO-ll of Figure 2.
Figure 11 is a detail view taken substantially on theline llll ct Figure 5 1, Figure 12 is a fragmentary detail sectional view taken on the line lI-il of Figure 11.
Figure 13 is an eievational view of a portion of a cable structure.
Referring tothe drawings by reference numerals it will be seen that the improved bulldozer comprises a blade I that is of conventional con: structlon and is provided on its rear side with hinge brackets 2 whereby through the medium of the hinge pins 3 the blade is connected with one end or reciprocating rods 4.
Intermediate its ends the blade I at the rear side thereoi is provided with a similar bracket 5 whereby through the medium of a hinge pin 6 the blade is connected to a headed rod 1 operating through a suitable guide in the cross frame mem- 5 her 8 at the front of the tractor indicated generally by the reference numeral 9. Suitable spring means It is provided for normally urging the blade I in a forward direction. Provided at opposite sides or the tractor are 10 substantially tubular guide members II, II in one or which issecured by suitably anchored blocks i2 and as best shown in Figure 3, a cylinder ii in which operates piston 14 provided with rod l5. 15
The piston rod I8 is connected with a slide rod through the medium or a coupling indicated 4 generally by thereference numeral it. Each rod 4 is provided with such a coupling 16.
As shown in Figure 10, each coupling I6 is in 20 the form of a block provided with a recess ll opening through opposite sides of the block and through the top of the block. For the recess l'l there is provided acover Ila secured to the block by any suitable fastening means. g y 25 Arranged in the recess I! are 'a-pair oi oppo-.
sitely swinging dogs ll normally urgedoutwardly 'through the medium of a spring l9. For-drawcable II is connected as at g: with a 'main cable 35 23 that extends toand is suitably connected with! a control lever 24 mounted on the tractor.
The cables 23 extend upwardly through suitable substantially conical shaped housings 28 secured to the cover plates lid of the blocks and 40 accommodated in slots 21 provided-in the topot the guide tubes ll.
Cooperable with the dogs II for securing the rods 4 at the desired projected or retracted position are suitably shaped notches I8 and II ar- 45 ranged in pairs internally oi the guide tubes H as best shown in Figure 9. As also shown in Figure 9 suitable guide blocks 30 are provided for the rods 4. It will thus be seen that with the dogs. It in the projected position shown in Fig- 50 ure 1'0 and engaged in the notches 28 the rods 4 will be held in a projected position; on the other hand with the dogs I8 engaged in the notches II rods 4 will be held in a retracted position. In release the dogs from the notches 28 or ll as the 5s 2 a case may be, lever 24 is operated for exerting a pull on the cables 23 and associated cables 20 for drawing the dogs I! inwardlb against the action of springs I! thus freeing the rods 4 to permit 5 the latter to move inwardly or outwardly depending upon which end of cylinder I3 is being charged with fluid for operating the piston ll.
In the present instance but one cylinder i3 is provided and at its respective opposite ends is equipped with caps 3|, 3! into which are tapped nipples 33, 34. The nipplesil, 34 are connected by flexible conduits as, as with a suitable source of fluid supply indicated generally by the reference numeral 31 and arranged in these conduits 35, 36 is a suitable control valve 38. It will thus be seen that to swing the blade I from the transverse position shown in Figure 1 to, for example, the dotted line position shown, in said figure, valve 38 is manipulated to permit a supply of oil or the like under pressure to the cylinder it at the cap equipped end 32. The oil entering the cylinder will then act on the piston M to cause the same to move forwardly p n release of the dogs I! from the notches 21!. In this manner,
25 the blade I will be moved to the dotted line position shown in Figure 1 and when this position is attained the dogs ll move opposite to and swing outwardly into engagement with the notches 28 for locking the rod 4 at the near side of the trac- 30- tor in projected position. In this connectionit will be understood that the rod 4 at the opposite side will move in a reverse direction or to the right in Figure 1 to assume the dotted position shown in Figure 1. Thus it will be seen that the blade I may be swung to a position diagonal to the line of draft and'either to the right or left in a quick and efllcient mannen,
To allow for the movement of the blade to the desired angular position the guide tubes II at 1 40 theirrear ends are pivoted to a frame F suitably mounted on the tractor as clearly shown in -Figure 2. In this connection it will be noted that to the rear end of each guide sleeve Ii there issuitably connected a tubular extension 39 which atone end is pivoted to the frame I? through the medium of a pivot pin 40. The tube extension 39 is provided with upper and lower slots to accommodate the pivot pin II and arranged inthe tube as best shown in Figure 4 is a block ll having an arcuate notch in one edge to engage the pin 40 as shown. This block 4| is normally urged into engagement with the pin 40 through the medium of a suitable coil spring 42. Thus an efficient pivotal connection between 103011 guide tube u and the frame F is providedipermitting the necessary swinging movement of the guide tubes incidental to a change in the angular position of the blade 1 relative to the line of draft.
It is thought that a clear understanding of 0 the invention will be had from' the foregoing and the invention, what is pin and normally urging the same forwardly with reference to the tractor, a scraper blade pivoted intermediate its endsto the thrust pin, a pair of guide tubes, spring cushioned devices pivotally connecting the guide tubes at one end thereof to the tractor at opposite sides of the latter, slide rods having ends slidably working in the guide tubes and outer ends pivotally connected with the scraper blade, hydraulic means connected with the slide rods for reciprocating the latter, and means for holding the guide rods at ime desired projected or retracted position.
'2. In combination with a tractor, a frame carried the eby, a pair of guide tubes disposed on the tractor a opposite sides of the tractor and pivoted at one end tothe frame, slide rods having ends mounted for reciprocation within the guide tubes, a scraper blade pivoted to the outer end of the slide rods, each of said guide tubes being provided with longitudinally spaced pairs of opposed notches, and spring pressed dogs pivotally mounted on each of the slide rods and adapted to engage the notches of a selected pair for holding the slide rods at the desired adjustment.
3. In combination with a tractor, a pair of guide tubes disposed one to each side of the tractor and pivotally mounted at one end of the tractor, slide rods having ends slidably working within said guide tubes, 9. scraper blade pivoted to the free ends of said slide rods, a cylinder mounted in at least one of saidguide tubes, a piston mounted for reciprocation in said cylinder and having a rod connected with a slide rod, hydraulic means connected with the cylinder for reciprocating the piston for varying the angle of the scraper blade with respect to the line of draft. and latch means associated with each slide rod and its guide tube whereby the guide rods may be selectively secured at the desired adjustment.
4. In combination with a tractor, a frame carried thereby, a thrust pin slidably mounted on 'the forward end of the frame, a scraper blade pivotally mounted on the free end of the thrust pin, a pair of guide tubes disposed one to each side of the tractor and pivotally connected at one end to the frame, slide rods having ends slidably working in said guide tubes and free ends pivotally connected'with the scraper blade, hy-
draulic means for reciprocating said slide rods,
and latch means for securing the slide rods at the desired projected or retracted position for securing the" blade at the desired angle relative to the line of draft.
5. In combination with a tractor, a scraper blade pivotally mounted on the tractor at the forward end of the latter, and means for swinging the blade to a desired angle with respect to the line of draft, said means including a guide tube, a slide rod having an end slidably working in the guide tube and a second end hinged to the scraper blade, interengaging means onsaid guide tube and said slide rod for securing the latter in either a projected or retracted position optionally, a cylinder mounted in the guide tube, a piston mounted for reciprocation in the cylinder, and said piston having a rod rigidly connected with the slide rod-for transmitting movement of the piston to the slide rod.
HARRY BURNEY THORPE.